CN106452049A - Combined circuit and power supply circuit used for combined circuit as well as display device - Google Patents
Combined circuit and power supply circuit used for combined circuit as well as display device Download PDFInfo
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- CN106452049A CN106452049A CN201611068998.4A CN201611068998A CN106452049A CN 106452049 A CN106452049 A CN 106452049A CN 201611068998 A CN201611068998 A CN 201611068998A CN 106452049 A CN106452049 A CN 106452049A
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- Prior art keywords
- power supply
- circuit
- switching power
- switch pipe
- input
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a combined circuit. The combined circuit comprises a power factor correction (PFC) circuit and a switching power supply, wherein an input end of the power factor correction circuit is connected with a direct-current voltage source; the input end of the switching power supply is connected with an output end of the power factor correction circuit and the output end of the switching power supply is connected with a load; the power factor correction circuit is used for converting the direct-current voltage source to the switching power supply through utilizing leakage inductance of the switching power supply, so as to supply power to the switching power supply; the switching power supply is used for outputting direct-current voltage so as to provide a stable power supply to the load. The invention further discloses a power supply circuit used for the combined circuit as well as a display device. According to the combined circuit provided by the invention, the leakage inductance of the switching power supply is used as an inner device of the PFC circuit to convert the direct-current voltage source; the leakage inductance is sufficiently utilized and an extra inductor component does not need to be used; a buffering circuit composed of a resistor, a capacitor and a diode does not need to be specially used for absorbing a voltage peak of the leakage inductance generated by the switching power supply, so that the cost of the circuit is reduced, and the power supply conversion efficiency is improved.
Description
Technical field
The present invention relates to field of circuit technology, the more particularly to power supply circuits of a kind of combinational circuit and its application, display.
Background technology
In the power supply application of medium size TV general by traditional PFC (Power Factor Correction, power because
Element correction) circuit and circuit of reversed excitation are combined, as shown in figure 1, pfc circuit is made up of boost circuit, will be defeated by inductance L1
Enter voltage and 380V is increased to by 110V/220V, then mainboard and backlight are supplied electricity to by circuit of reversed excitation.But, in circuit of reversed excitation
In, due to the presence of leakage inductance, due to voltage spikes can be produced, and then be easily caused switching tube Q2 when switching tube Q2 ends breakdown,
Accordingly, it would be desirable to increase buffer circuit in circuit of reversed excitation to absorb the due to voltage spikes, which is by resistance RM104, electric capacity C14 and two poles
Pipe DM103 is constituted, and then protects the switching tube Q2 in circuit of reversed excitation not breakdown.Due to increasing buffer circuit, cause cost relatively
Height, also, the energy of leakage inductance absorbed in vain, is not fully used, and less efficient.
Content of the invention
It is an object of the invention to, for the problem that above-mentioned power supply in prior art is present, provide a kind of combinational circuit and
The power supply circuits of its application, display.
The present invention solves the technical scheme that adopted of above-mentioned technical problem and there is provided a kind of combinational circuit, including power because
Number correcting circuit and Switching Power Supply, the input of the circuit of power factor correction is connected with direct voltage source, the switch electricity
The input in source is connected with the outfan of the circuit of power factor correction, and the outfan of the Switching Power Supply is connected with load；
Wherein, the power factor correction circuit is changed the direct voltage source to institute using the leakage inductance existing for the Switching Power Supply
Switching Power Supply is stated to power to the Switching Power Supply；The Switching Power Supply output DC voltage is stable to provide to the load
Power supply.
Wherein, the circuit of power factor correction includes first switch pipe, commutation diode and filter capacitor, the switch
The input of power supply includes first input end and the second input, the drain electrode of the first switch pipe directly with the DC voltage
Source connects, and the source electrode of the first switch pipe is connected with the anode of the commutation diode, the negative electrode at the commutation diode end
Be connected with reference ground, the source electrode of the first switch pipe is also connected with one end of the filter capacitor, the filter capacitor another
One end is connected with the first input end of the Switching Power Supply, and the drain electrode of first switch pipe is also input into the second of the Switching Power Supply
End connection.
Wherein, the Switching Power Supply includes second switch pipe, resistance and transformator, the drain electrode of the second switch pipe and institute
The first end connection of the primary coil of transformator is stated, the source electrode of the second switch pipe is connected with reference ground through the resistance,
The secondary coil of the transformator is connected with the load, and wherein, the first end of the primary coil of the transformator is used as described
The first input end of Switching Power Supply, the second end of the primary coil of the transformator is input into as the second of the Switching Power Supply
End.
Wherein, also include：Control circuit, respectively with the grid of the first switch pipe and the grid of the second switch pipe
Connection, for controlling the on or off of the first switch pipe and the second switch pipe.
Another technical scheme that present invention solution above-mentioned technical problem is adopted there is provided a kind of power supply circuits, including whole
Stream device and combinational circuit, the input of the commutator with exchange electrical connection, the input of the combinational circuit and the rectification
The outfan connection of device, the outfan of the combinational circuit is connected with load；
Wherein, the combinational circuit includes circuit of power factor correction and Switching Power Supply, the input of the Switching Power Supply
It is connected with the outfan of the circuit of power factor correction；The circuit of power factor correction is using existing for the Switching Power Supply
Leakage inductance the DC voltage that the commutator is exported is changed to the Switching Power Supply to power to the Switching Power Supply；Described open
Power supply output DC voltage is closed stable power supply is provided to the load.
Wherein, the circuit of power factor correction includes first switch pipe, commutation diode and filter capacitor, the switch
The input of power supply includes first input end and the second input, the drain electrode of the first switch pipe directly with the DC voltage
Source connects, and the source electrode of the first switch pipe is connected with the anode of the commutation diode, the negative electrode at the commutation diode end
Be connected with reference ground, the source electrode of the first switch pipe is also connected with one end of the filter capacitor, the filter capacitor another
One end is connected with the first input end of the Switching Power Supply, and the drain electrode of first switch pipe is also input into the second of the Switching Power Supply
End connection.
Wherein, the Switching Power Supply includes second switch pipe, resistance and transformator, the drain electrode of the second switch pipe and institute
The first end connection of the primary coil of transformator is stated, the source electrode of the second switch pipe is connected with reference ground through the resistance,
The secondary coil of the transformator is connected with the load, and wherein, the first end of the primary coil of the transformator is used as described
The first input end of Switching Power Supply, the second end of the primary coil of the transformator is input into as the second of the Switching Power Supply
End.
Wherein, the combinational circuit also includes：Control circuit, the grid and described second with the first switch pipe respectively
The grid connection of switching tube, for controlling the on or off of the first switch pipe and the second switch pipe.
Wherein, also include filter circuit, the filter circuit includes the first electric capacity of parallel connection and the second electric capacity, the parallel connection
The first electric capacity be connected the outfan and described first of reference ground, the other end and the commutator with one end of second electric capacity
The drain electrode connection of switching tube.
Another technical scheme that present invention solution above-mentioned technical problem is adopted there is provided a kind of display, and its feature exists
In including mainboard, backlight module and to the mainboard and the above-mentioned power supply circuits of backlight module offer power supply.
Beneficial effects of the present invention have：Combinational circuit using the leakage inductance existing for Switching Power Supply as pfc circuit inside device
Part carries out conversion dc voltage source, makes full use of leakage inductance, without the need for using an inductance component extra, also, without the need for specially make
The due to voltage spikes of the leakage inductance produced by Switching Power Supply is absorbed with buffer circuit, reduces circuit cost, power supply conversion efficiency is provided.
Description of the drawings
Below in conjunction with drawings and the embodiments, the invention will be further described, in accompanying drawing：
Fig. 1 is the combinational circuit diagram of pfc circuit of the prior art and circuit of reversed excitation；
Fig. 2 is the structural representation of the combinational circuit embodiment of the present invention；
Fig. 3 is a kind of physical circuit figure of the combinational circuit of the above embodiment of the present invention；
Fig. 4 is the equivalent circuit of pfc circuit in above-mentioned specific combinational circuit；
Fig. 5 is the structural representation of the power supply circuits embodiment of the present invention；
Fig. 6 is a kind of physical circuit figure of the power supply circuits of the above embodiment of the present invention；
Fig. 7 is the structural representation of the display embodiment of the present invention.
Specific embodiment
For making those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings and it is embodied as
Mode is described in further detail to technical scheme.
As shown in Fig. 2 being the structural representation of the combinational circuit embodiment of the present invention, the combinational circuit 200 can be applicable to
Display such as TV (English abbreviation：TV in power supply), including power factor correction circuit (hereinafter referred to as pfc circuit) 210 Hes
Switching Power Supply 220, wherein, the input of pfc circuit 210 is connected with direct voltage source V1, the input of Switching Power Supply 220 with
The outfan connection of pfc circuit 210, outfan are connected with load 230.
Pfc circuit 210 is changed direct voltage source V1 to Switching Power Supply 220 using the leakage inductance existing for Switching Power Supply 220
To power to Switching Power Supply 220；Switching Power Supply 220 exports DC voltage V2 to provide stable power supply to load 230.
In the present embodiment, the direct voltage source V1 of the input connection of pfc circuit 210 is by alternating current through rectification circuit
Obtained from.Switching Power Supply 220 is DC/DC (Direct Current/Direct Current, DC-DC) change-over circuit,
Including DC/DC transducer and switching tube, which can be the DC/DC transducer of single tube, for example, inverse-excitation type switch power-supply, it is also possible to
For the DC/DC transducer of multitube, such as double-transistor flyback formula, due to DC/DC transducer, there is leakage inductance in Switching Power Supply.
It should be noted that the combinational circuit also includes the control for controlling the working condition of pfc circuit and Switching Power Supply
Circuit (not shown) processed, the control circuit controls the working condition of pfc circuit, and then direct voltage source is changed to switch
Power supply, and then the working condition of the control circuit controlling switch power supply, export DC voltage, to realize unidirectional current to galvanic
Conversion, powering load.The control circuit can adopt circuit of the prior art, such as control chip, and here is not carried out in detail
Explanation.
By above-described embodiment, the combinational circuit using the leakage inductance existing for Switching Power Supply as pfc circuit internal components
Carry out conversion dc voltage source, make full use of leakage inductance, without the need for additionally using an inductance component, also, without the need for exclusively with
The buffer circuit being made up of resistance, electric capacity and diode reduces electricity absorbing the due to voltage spikes of the leakage inductance produced by Switching Power Supply
Road cost, provides power supply conversion efficiency.
As shown in figure 3, be a kind of physical circuit figure of the combinational circuit of the above embodiment of the present invention, the combinational circuit 300
Including pfc circuit 310 and Switching Power Supply 320, wherein, pfc circuit 310 includes first switch pipe Q1, commutation diode D1 and filter
Ripple electric capacity C1, Switching Power Supply 320 include the drain electrode of first input end P1 and the second input P2, first switch pipe Q1 directly with directly
The V1 connection of stream voltage source, the source electrode of first switch pipe Q1 is connected with the anode of commutation diode D1, the moon of commutation diode end D1
Pole is connected with reference ground, and the source electrode of first switch pipe Q1 is also connected with one end of filter capacitor C1, the other end of filter capacitor C1
It is connected with the first input end P1 of Switching Power Supply 320, second input for draining also with Switching Power Supply 320 of first switch pipe Q1
P2 connects.Use of the pfc circuit 310 to 320 leakage inductance of Switching Power Supply is realized using the circuit structure.
Further, Switching Power Supply 320 includes second switch pipe Q2, resistance R1 and transformator T1, second switch pipe Q2's
Drain electrode is connected with one end of the primary coil of transformator T1, and the source electrode of second switch pipe Q2 is connected with reference ground through resistance R1,
The secondary coil of transformator T1 is connected with load, and wherein, the first end of the primary coil of transformator T1 is used as Switching Power Supply 320
First input end P1, the second end of the primary coil of transformator T1 is used as the second input P2 of Switching Power Supply 320.Need explanation
, in order to ensure the stability of output voltage, the secondary coil of transformator T1 is passed through by commutation diode D2 and commutation capacitor
The rectification circuit that C2 is constituted is connected with load again.
Further, the combinational circuit 300 also includes control circuit 330, the control circuit 330 respectively with first switch pipe
The grid of Q1 and second switch pipe Q2 grid connection, for control first switch pipe Q1 and second switch pipe Q2 conducting or
Cut-off.The control circuit 330 can be that two sub- control circuits are combined, and first switch pipe Q1 is corresponding to a son control electricity
Road, second switch end Q2 corresponds to another control circuit.Control circuit 330 samples scheme of the prior art realizing to
One switching tube Q1 and the control of second switch pipe Q2, for example, include voltage sample part, comparator etc..
In the present embodiment, for pfc circuit 310, due to the Same Name of Ends of the transformator T1 in Switching Power Supply 320,
Transformator T1 is equivalent to short circuit, and now, pfc circuit 310 is using leakage inductance L existing for Switching Power Supply 320, therefore, now, PFC
The equivalent circuit of circuit 310 as shown in figure 4, leakage inductance L changes its storing energy to Switching Power Supply 320, arrow as shown in FIG.
Flow direction, its storing energy is charged to filter capacitor C1 by leakage inductance L by commutation diode D1, to export energy, Jin Erzhuan
Switching Power Supply 320 is given, so far, pfc circuit 310 completes its function, and then powers to Switching Power Supply 320, and Switching Power Supply 320 is defeated
Going out DC voltage V2, stable power supply is provided to load.
As shown in figure 5, being the structural representation of the power supply circuits embodiment of the present invention, the power supply circuits 500 can be applicable to
In the power supply of display such as TV, it is connected with mainboard in display and backlight, including commutator 510 and combinational circuit 520, its
In, the input of commutator 510 is connected with alternating current Vin, the alternating current of such as 220V, defeated for changing alternating current Vin
Go out for DC voltage；The input of combinational circuit 520 is connected with the outfan of commutator 510, outfan is connected with load 540,
For example, it is desired to the mainboard that powers or backlight module.
The commutator 510 can be bridge rectifier, the rectifying device being made up of two or four diodes.In this enforcement
In example, commutator 510 is made up of four diodes.
The combinational circuit 520 includes pfc circuit 521 and Switching Power Supply 522, the input of Switching Power Supply 522 and pfc circuit
521 outfan connection；The unidirectional current that commutator 510 is exported by pfc circuit 521 using the leakage inductance existing for Switching Power Supply 522
Pressure V1 is changed to Switching Power Supply 522 to power to Switching Power Supply 522；Switching Power Supply 522 exports DC voltage V2 to carry to load
For stable power supply.
With reference to Fig. 6, pfc circuit 521 includes first switch pipe Q1, commutation diode D1 and filter capacitor C1, first
The drain electrode of switching tube Q1 is directly connected with direct voltage source V1, and the source electrode of first switch pipe Q1 is connected with the anode of commutation diode D1
Connect, the negative electrode of commutation diode end D1 is connected with reference ground, the source electrode of first switch pipe Q1 is also connected with one end of filter capacitor C1
Connect, the other end of filter capacitor C1 is connected with the first input end P1 of Switching Power Supply 522, the drain electrode of first switch pipe Q1 also with open
Close the second input P2 connection of power supply 522.
Further, with reference to Fig. 6, Switching Power Supply 522 includes second switch pipe Q2, resistance R1 and transformator T1, the
The drain electrode of two switching tube Q2 is connected with the first end of the primary coil of transformator T1, and the source electrode of second switch pipe Q2 is through resistance R1
It is connected with reference ground, the secondary coil of transformator T1 is connected with load, wherein, the first end conduct of the primary coil of transformator T1
The first input end P1 of Switching Power Supply 522, the second end of the primary coil of transformator T1 is input into as the second of Switching Power Supply 522
End P2.It should be noted that for the stability for ensureing output voltage, the secondary coil of transformator T1 is passed through by commutation diode
The rectification circuit that D2 and commutation capacitor C2 is constituted is connected with load again.
Further, with reference to Fig. 6, the combinational circuit 520 also includes control circuit 523, and the control circuit 523 is respectively with
The grid connection of the grid of one switching tube Q1 and second switch pipe Q2, for controlling first switch pipe Q1's and second switch pipe Q2
On or off.The control circuit 523 can be that two sub- control circuits are combined, and first switch pipe Q1 corresponds to one
Sub- control circuit, second switch end Q2 corresponds to another control circuit.Control circuit 330 sample scheme of the prior art come
The control to first switch pipe Q1 and second switch pipe Q2 is realized, for example, includes voltage sample part, comparator etc..
In the present embodiment, voltage of the alternating current Vin after commutator 510 is used as the input voltage of Switching Power Supply 522,
The second switch pipe Q2 of Switching Power Supply 522 on or off under the control of control circuit 523 so that pfc circuit 521 defeated
Enter electric current with the phase place change of alternating current Vin, and the leakage that pfc circuit 521 is present by the transformator T1 in Switching Power Supply 522
The DC voltage V1 that commutator 510 is exported by sense is changed to Switching Power Supply 522.
The power supply circuits 500 also include filter circuit 530, the filter circuit 530 be connected to the outfan of commutator 510 with
Between the input of combinational circuit 520, with reference to Fig. 6, the filter circuit 530 includes the electricity of the first electric capacity C3 of parallel connection and second
Hold C4, wherein, the first electric capacity C3 in parallel is connected the defeated of reference ground, the other end and commutator 510 with one end of the second electric capacity C4
The drain electrode for going out end and first switch pipe Q1 connects.The model of the first electric capacity C3 and the second electric capacity C4 is differed, wherein, the first electric capacity
C3 is jumbo electric capacity, and the second electric capacity C4 is the electric capacity of normal capacity, and certainly, the first electric capacity C3 can also be normal capacity
Electric capacity, the second electric capacity C4 can also be jumbo electric capacity.
By above-described embodiment, the leakage inductance existing for Switching Power Supply is carried out changing directly as the internal components of pfc circuit
Stream voltage source, makes full use of leakage inductance, without the need for using an inductance component extra, also, without the need for exclusively with by resistance, electric capacity
The due to voltage spikes of the leakage inductance produced by Switching Power Supply being absorbed with the buffer circuit of diode composition, reduces circuit cost, provide
Power supply conversion efficiency.
As shown in fig. 7, be the structural representation of the display embodiment of the present invention, the display 700 include mainboard 710,
Backlight module 720 and power supply circuits 730, wherein, mainboard 710 and backlight module 720 are connected with the outfan of power supply circuits 730 respectively
Connect, the input connection alternating current of power supply circuits 730, such as domestic 220V.Power supply circuits 730 have been made detailed in the above-described embodiments
Describe in detail bright, above-described embodiment is refer to, and it should be noted that the power supply circuits 730 in above-described embodiment are to middle-sized
Display 700 is powered, and effect is best.Mainboard 710 is also connected with backlight module 720, in the present embodiment, to mainboard 710
It is not construed as limiting with the structure of backlight module 720, mainboard 710 and the backlight module 720 of any structure can be adopted.
Embodiments of the present invention are these are only, not thereby limits the scope of the claims of the present invention, every utilization present invention
Equivalent structure or equivalent flow conversion that description and accompanying drawing content are made, or directly or indirectly it is used in other related technology
Field, all includes the scope of patent protection in the present invention in the same manner.
Claims (10)
1. a kind of combinational circuit, it is characterised in that including circuit of power factor correction and Switching Power Supply, the PFC
The input of circuit is connected with direct voltage source, the output of the input of the Switching Power Supply and the circuit of power factor correction
End connection, the outfan of the Switching Power Supply is connected with load；
Wherein, the direct voltage source is changed by the power factor correction circuit using the leakage inductance existing for the Switching Power Supply
To the Switching Power Supply to power to the Switching Power Supply；The Switching Power Supply output DC voltage is steady to provide to the load
Fixed power supply.
2. the combinational circuit according to claim 1, it is characterised in that the circuit of power factor correction includes that first opens
Guan Guan, commutation diode and filter capacitor, the input of the Switching Power Supply includes first input end and the second input, described
The drain electrode of first switch pipe is directly connected with the direct voltage source, the source electrode of the first switch pipe and the commutation diode
Anode connection, the negative electrode at the commutation diode end is connected with reference ground, the source electrode of the first switch pipe also with the filter
One end connection of ripple electric capacity, the other end of the filter capacitor is connected with the first input end of the Switching Power Supply, first switch
The drain electrode of pipe is also connected with the second input of the Switching Power Supply.
3. the combinational circuit according to claim 2, it is characterised in that the Switching Power Supply includes second switch pipe, electricity
Resistance and transformator, the drain electrode of the second switch pipe is connected with the first end of the primary coil of the transformator, and described second opens
The source electrode for closing pipe is connected with reference ground through the resistance, and the secondary coil of the transformator is connected with the load, wherein, institute
State transformator primary coil first end as the Switching Power Supply first input end, the primary coil of the transformator
Second end is used as the second input of the Switching Power Supply.
4. the combinational circuit according to claim 3, it is characterised in that also include：
Control circuit, is connected with the grid of the first switch pipe and the grid of the second switch pipe, respectively for controlling
State the on or off of first switch pipe and the second switch pipe.
5. a kind of power supply circuits, it is characterised in that including commutator and combinational circuit, the input of the commutator and alternating current
Connection, the input of the combinational circuit is connected with the outfan of the commutator, the outfan of the combinational circuit and load
Connection；
Wherein, the combinational circuit includes circuit of power factor correction and Switching Power Supply, the input of the Switching Power Supply and institute
State the outfan connection of circuit of power factor correction；The circuit of power factor correction is using the leakage existing for the Switching Power Supply
Feeling the DC voltage of commutator output is changed to the Switching Power Supply to power to the Switching Power Supply；The switch electricity
Output DC voltage in source is to provide stable power supply to the load.
6. power supply circuits according to claim 5, it is characterised in that the circuit of power factor correction includes that first opens
Guan Guan, commutation diode and filter capacitor, the input of the Switching Power Supply includes first input end and the second input, described
The drain electrode of first switch pipe is directly connected with the direct voltage source, the source electrode of the first switch pipe and the commutation diode
Anode connection, the negative electrode at the commutation diode end is connected with reference ground, the source electrode of the first switch pipe also with the filter
One end connection of ripple electric capacity, the other end of the filter capacitor is connected with the first input end of the Switching Power Supply, first switch
The drain electrode of pipe is also connected with the second input of the Switching Power Supply.
7. power supply circuits according to claim 6, it is characterised in that the Switching Power Supply includes second switch pipe, electricity
Resistance and transformator, the drain electrode of the second switch pipe is connected with the first end of the primary coil of the transformator, and described second opens
The source electrode for closing pipe is connected with reference ground through the resistance, and the secondary coil of the transformator is connected with the load, wherein, institute
State transformator primary coil first end as the Switching Power Supply first input end, the primary coil of the transformator
Second end is used as the second input of the Switching Power Supply.
8. power supply circuits according to claim 7, it is characterised in that the combinational circuit also includes：
Control circuit, is connected with the grid of the first switch pipe and the grid of the second switch pipe, respectively for controlling
State the on or off of first switch pipe and the second switch pipe.
9. power supply circuits according to claim 8, it is characterised in that also include filter circuit, the filter circuit bag
Include the first electric capacity and second electric capacity of parallel connection, the first in parallel electric capacity be connected with one end of second electric capacity reference ground,
The other end is connected with the drain electrode of the outfan of the commutator and the first switch pipe.
10. a kind of display, it is characterised in that carry including mainboard, backlight module and to the mainboard and the backlight module
The power supply circuits as any one of claim 5-9 of power supply source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611068998.4A CN106452049A (en) | 2016-11-28 | 2016-11-28 | Combined circuit and power supply circuit used for combined circuit as well as display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611068998.4A CN106452049A (en) | 2016-11-28 | 2016-11-28 | Combined circuit and power supply circuit used for combined circuit as well as display device |
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| CN106452049A true CN106452049A (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611068998.4A Pending CN106452049A (en) | 2016-11-28 | 2016-11-28 | Combined circuit and power supply circuit used for combined circuit as well as display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347318A (en) * | 2018-11-23 | 2019-02-15 | 四川长虹电器股份有限公司 | Double flyback sourse circuits of recoverable power factor |
| CN111275952A (en) * | 2019-02-01 | 2020-06-12 | 奥克斯空调股份有限公司 | Wireless communication system and air conditioner direct current motor power supply system using same |
| CN115242066A (en) * | 2022-09-15 | 2022-10-25 | 荣耀终端有限公司 | Power supply circuit and product thereof |
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| CN109347318A (en) * | 2018-11-23 | 2019-02-15 | 四川长虹电器股份有限公司 | Double flyback sourse circuits of recoverable power factor |
| CN111275952A (en) * | 2019-02-01 | 2020-06-12 | 奥克斯空调股份有限公司 | Wireless communication system and air conditioner direct current motor power supply system using same |
| CN115242066A (en) * | 2022-09-15 | 2022-10-25 | 荣耀终端有限公司 | Power supply circuit and product thereof |
| CN115242066B (en) * | 2022-09-15 | 2023-02-07 | 荣耀终端有限公司 | Power supply circuit and product thereof |
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